Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Polyphase
Patent
1975-08-20
1977-05-10
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Polyphase
324 86, 324115, G01R 1900, G01R 2500
Patent
active
040231011
ABSTRACT:
For measuring and indicating phase voltage, phase sequence and other electrical values in a three-phase power system, and electrical values in single-phase and DC systems, a unitary instrument or apparatus includes a meter movement and three phase-resistors of equal value which are connected to a common juncture defining a neutral point, with a first phase-resistor connected in series with the meter. The three phases of the external circuit to be tested are connected respectively to the three phase-resistors through a three-pole three-position selector switch for selecting the three different phase to "phase-resistor" relationships. A switch connected between a third phase-resistor and the common juncture performs the alternative functions of opening or closing this circuit. A phase-component of different impedance, resistance or reactance value than the phase-resistors is connected through a switch to the common juncture for connecting this phase-resistor to said common juncture in lieu of the third phase-resistor. Phase voltage can be measured when the three phase-resistors are connected to the common juncture; and phase sequence can be indicated when the phase-component is connected in the circuit for one phase in place of a phase-resistor. An amperage measuring circuit is connected to the meter. A third selector switch separates the voltage measuring and amperage measuring functions; and selects shunt resistors for connection across the meter for different voltage or amperage ranges.
REFERENCES:
patent: 1684056 (1928-09-01), Evans
Karlsen Ernest F.
Murphy Peter J.
Rolinec Rudolph V.
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